sample data for 6 months
2010
Jan
feb
mar
apr
may
jun
stock price
Starbucks
22
23
24
26
26
24
Using Megastat|Descriptive Stats
Find sample mean
sample variance
sample std dev
sample Cv = std dev/ mean
stock price
Panera
71
73
76
78
81
75
Using Megastat|De
Descriptive statistics
count
mean
sample variance
sample standard deviation
minimum
maximum
range
sum
sum of squares
deviation sum of squares (SSX)
population variance
population standard deviation
#1
10
24.6480
1,379.0318
37.1353
-56.02
76.46
132.48
246.
Chapter 5 ANOVA Exercise
Complete the following problems from your textbook, page 272 ~ 273
5.47
a. Ho = mu1 = mu2 = mu3
Ha = At least one of the means are different
b. We fail to reject the null hypothesis. There is no sufficient evidence to infer a diff
There are 3 different types of T-test as below. Fill each section with less than 200 words and show R
code for either Confidence Interval or Hypothesis testing with brief description.
1. One Sample T-test
Description:
This is a statistical method used to
Dataset: Employment Rate
> summary(EmploymentRate)
Year
Jan
Feb
Mar
Apr
Min. :2000 Min. :58.30 Min. :58.40 Min. :58.40 Min. :58.40
1st Qu.:2004 1st Qu.:58.75 1st Qu.:58.75 1st Qu.:58.90 1st Qu.:58.85
Median :2008 Median :62.35 Median :62.35 Median :62.30
4.3
a) Average = 13.65, Median = 14
b) S.D. = 1.91, IQR = 2. One SD is within the Q1 and Q1
c) Z16= 1.23, which doesnt look unusual since it is within 2 SD of the mean.
Z18= 2.23, which is generally considered unusual.
d) Usually the estimates changes fro
Assignment 2
Solve below questions using R. It is highly recommend to draw a graph and shadow the region
to see the probability. No need to attach the graph or curve unless specified.
1 (Exercise 3.7) The average daily high temperature in June in LA is 77
Statistics 260
Homework 1
Chelsea Poirier
11562906
The movie The Joy of Stats was interesting and at times, even funny. One
topic that I found interesting was the San Francisco crime maps. The SFPD has
started using maps that look like plot graphs to show
Firm
Abercrombie & Fitch
Aeropostal
American Eagle
Ann Taylor
Bebe
Bluefly
Bon-Ton Stores
Cache
Charming Shoppes
Chicos
Childrens Place
Christopher & Banks
Coach
Coldwater Creek
Columbia
Dillards
Dress Barn
Footlocker
Gap
Jos. A. Bank
Kohls
Limited
Mens W
Name:
Math 1011 Intro to Statistics
Spring 2011
QUIZ 6 p-Values
4/14/11
1. You are to run an experiment to determine if your coin is fair or not. Flip it 20 times and record the
results:
Trial
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Result
(a)
Name:
Math 1011 Intro to Statistics
Spring 2011
QUIZ 5 Condence Intervals
3/30/11
1. Gallup polled 3557 people last week and found 45% approve of the job President Obama is doing, 47%
disapprove, and 8% are neutral. Find 95% condence intervals for each of
Name:
Math 1011 Intro to Statistics
Spring 2011
QUIZ 4 Probability Histograms
3/23/11
1. Consider the random variable tracking the number of heads in 4 ips of a fair coin. Draw a probability
histogram for this random variable.
Solution: First, compute f (
Name:
Math 1011 Intro to Statistics
Spring 2011
QUIZ 3 Probability
2/16/11
1. An urn contains 3 red balls, 2 blue balls, and 5 green balls.
(a) A ball is pulled out of the urn.
(i) What is the probability that it is blue?
(ii) What is the probability that
Name:
Math 1011 Intro to Statistics
Spring 2011
QUIZ 2 Normal Distribution
1/31/11
1. Suppose a set of test scores are well approximated by a normal distribution with mean = 54 and
standard deviation = 11.
(a) What percentage of scores were above 70?
(b)
Name:
Math 1011 Intro to Statistics
Spring 2011
QUIZ 1 Histograms
1/24/11
1. In a recent football game, one team (we will call them the Packers) ran 57 plays, and the other (call
them the Bears) ran 61. The tables below list the number of times a play gai
Name:
Student ID:
Math 1011 Intro to Statistics
Spring 2011
Final Exam
Show all work. Answers without work will receive no credit. You may use any non-graphing
calculator. There are 12 questions worth 8 or 9 points each. 2,4,6, and 12 are the 9 point prob
Name:
Student ID:
Math 1011 Intro to Statistics
Spring 2011
Exam 3
Show all work. Answers without work will receive no credit. You may use any non-graphing
calculator. There are 7 questions worth 14 points each.
1. A statistician is stranded on a desert i
Name:
Student ID:
Math 1011 Intro to Statistics
Spring 2011
Exam 2
Show all work. Answers without work will receive no credit. You may use any non-graphing
calculator. There are 7 questions worth 14 points each, except for number 3, which is worth 16 poin
Name:
Student ID:
Math 1011 Intro to Statistics
Spring 2011
Exam 1
Show all work. Answers without work will receive no credit. You may use any non-graphing
calculator. There are 8 questions worth 12 points each, except for number 5, which is worth 16 poin